bpo-25455: Fixed crashes in repr of recursive buffered file-like objects. (#514) (#722)
(cherry picked from commit a5af6e1af77ee0f9294c5776478a9c24d9fbab94)
diff --git a/Lib/test/test_fileio.py b/Lib/test/test_fileio.py
index 3da210a..57a0265 100644
--- a/Lib/test/test_fileio.py
+++ b/Lib/test/test_fileio.py
@@ -10,7 +10,7 @@
from functools import wraps
from test.support import (TESTFN, TESTFN_UNICODE, check_warnings, run_unittest,
- make_bad_fd, cpython_only)
+ make_bad_fd, cpython_only, swap_attr)
from collections import UserList
import _io # C implementation of io
@@ -176,6 +176,12 @@
finally:
os.close(fd)
+ def testRecursiveRepr(self):
+ # Issue #25455
+ with swap_attr(self.f, 'name', self.f):
+ with self.assertRaises(RuntimeError):
+ repr(self.f) # Should not crash
+
def testErrors(self):
f = self.f
self.assertFalse(f.isatty())